A:蔗糖酯可看成是由高级脂肪酸和蔗糖形成的酯
B:合成该蔗糖酯的反应属于取代反应
C:蔗糖分子中含有8个羟基
D:该蔗糖酯在稀硫酸作用下水解,水解过程中只有硬脂酸和葡萄糖两种产物
有四段导线,甲、乙、丙都是铜线,丁是镍铬合金线,甲与乙等长而甲比乙粗,乙与丙等粗而乙比丙短,丙与丁等长且等粗.关于它们的电阻,下列判断中正确的是( )
-My parents our home for a few hours when I arrived. I didn't meet them.-You could call them if you wanted to know where they were.